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sh: Add sys_cacheflush() call for SH CPUs.

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Adds a system call to allow user code to flush code from the cache.
You can use instructions for the data side, but the iside can
only be done by a flush ROM which really only works with a direct
mapped cache. The later SH4's have 2 way Iside, so this call allows
a portable way to flush the cache.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Stuart Menefy
2009-08-24 18:16:56 +09:00
committed by Paul Mundt
parent a5cf9e2444
commit 6d243dd370
7 changed files with 60 additions and 5 deletions
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2
arch/sh/include/asm/Kbuild
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@@ -1,6 +1,6 @@
include include/asm-generic/Kbuild.asm
header-y += cpu-features.h
header-y += cachectl.h cpu-features.h
unifdef-y += unistd_32.h
unifdef-y += unistd_64.h

12
arch/sh/include/asm/cachectl.h Normal file
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@@ -0,0 +1,12 @@
#ifndef _SH_CACHECTL_H
#define _SH_CACHECTL_H
/* Definitions for the cacheflush system call. */
#define CACHEFLUSH_D_INVAL 0x1 /* invalidate (without write back) */
#define CACHEFLUSH_D_WB 0x2 /* write back (without invalidate) */
#define CACHEFLUSH_D_PURGE 0x3 /* writeback and invalidate */
#define CACHEFLUSH_I 0x4
#endif /* _SH_CACHECTL_H */

2
arch/sh/include/asm/unistd_32.h
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@@ -132,7 +132,7 @@
#define __NR_clone 120
#define __NR_setdomainname 121
#define __NR_uname 122
#define __NR_modify_ldt 123
#define __NR_cacheflush 123
#define __NR_adjtimex 124
#define __NR_mprotect 125
#define __NR_sigprocmask 126

2
arch/sh/include/asm/unistd_64.h
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@@ -137,7 +137,7 @@
#define __NR_clone 120
#define __NR_setdomainname 121
#define __NR_uname 122
#define __NR_modify_ldt 123
#define __NR_cacheflush 123
#define __NR_adjtimex 124
#define __NR_mprotect 125
#define __NR_sigprocmask 126